Between my brother and I, we have a bucketload. Mostly Vigor 2830n's, with a smattering of Vigor 2920n's.
They are fantastic. And shite. Wonderful and frustrating. In equal measures.
When you find a firmware and configuration that works for you, hard to beat in the sub £250 price range.
Generally, every time you try to do something "clever", you'll find that the firmware is buggy and it doesn't work as expected, or worse still, it drops its pants, bends over, and invites the whole Internet to have a piece.
We probably do use them far beyond what most people would dream of doing - a fact born out when we send configs to their support people when things are broken, and they take one look and immediately pass up the support chain.
If either my bro or I were buying another router tomorrow, it would likely be another £200 Draytek if that was the price range I was constrained to. Mainly due to a combination of flexibility and the UK support are pretty good (though nowhere near in the league of Enterprise products level of support).
My biggest complaint, aside from buggy/quirky firmware, is the firewall is, well, shite. Not enough room for rules, and not very intelligent.